Check Your Answers Worksheet

Maths tricks trick 22: Last-digit detective · Set 126 · 40 questions

The trick (Last digits only): Multiply (or add) only the last digits of the two numbers. The last digit of that result is the last digit the answer must have. Different last digit → wrong for sure. Same last digit → it passes the check (work it out in full to be certain).

1. 1.Last-digit check: is 208 + 438 = 646 right or wrong? (a) Wrong (b) Right
2. 2.Last-digit check: is 152 + 399 = 552 right or wrong? (a) Right (b) Wrong
3. 3.Last-digit check: is 151 + 551 = 702 right or wrong? (a) Right (b) Wrong
4. 4.Last-digit check: is 923 + 709 = 1625 right or wrong? (a) Wrong (b) Right
5. 5.Last-digit check: is 814 + 105 = 919 right or wrong? (a) Wrong (b) Right
6. 6.Last-digit check: is 80 × 17 = 1359 right or wrong? (a) Right (b) Wrong
7. 7.Last-digit check: is 263 + 458 = 721 right or wrong? (a) Right (b) Wrong
8. 8.Last-digit check: is 25 × 19 = 475 right or wrong? (a) Wrong (b) Right
9. 9.Last-digit check: is 39 × 18 = 702 right or wrong? (a) Right (b) Wrong
10. 10.Last-digit check: is 913 + 146 = 1053 right or wrong? (a) Right (b) Wrong
11. 11.Last-digit check: is 384 + 673 = 1057 right or wrong? (a) Right (b) Wrong
12. 12.Last-digit check: is 19 × 77 = 1463 right or wrong? (a) Wrong (b) Right
13. 13.Last-digit check: is 51 × 50 = 2550 right or wrong? (a) Wrong (b) Right
14. 14.Last-digit check: is 57 × 26 = 1482 right or wrong? (a) Right (b) Wrong
15. 15.Last-digit check: is 688 + 512 = 1200 right or wrong? (a) Wrong (b) Right
16. 16.Last-digit check: is 24 × 25 = 600 right or wrong? (a) Wrong (b) Right
17. 17.Last-digit check: is 91 × 90 = 8190 right or wrong? (a) Wrong (b) Right
18. 18.Last-digit check: is 98 × 59 = 5782 right or wrong? (a) Wrong (b) Right
19. 19.Last-digit check: is 321 + 262 = 591 right or wrong? (a) Wrong (b) Right
20. 20.Last-digit check: is 111 + 779 = 890 right or wrong? (a) Right (b) Wrong
21. 21.Last-digit check: is 47 × 99 = 4659 right or wrong? (a) Wrong (b) Right
22. 22.Last-digit check: is 804 + 380 = 1184 right or wrong? (a) Wrong (b) Right
23. 23.Last-digit check: is 234 + 233 = 473 right or wrong? (a) Wrong (b) Right
24. 24.Last-digit check: is 323 + 845 = 1168 right or wrong? (a) Right (b) Wrong
25. 25.Last-digit check: is 128 + 541 = 670 right or wrong? (a) Wrong (b) Right
26. 26.Last-digit check: is 37 × 33 = 1215 right or wrong? (a) Right (b) Wrong
27. 27.Last-digit check: is 763 + 147 = 910 right or wrong? (a) Right (b) Wrong
28. 28.Last-digit check: is 62 × 67 = 4154 right or wrong? (a) Right (b) Wrong
29. 29.Last-digit check: is 418 + 266 = 684 right or wrong? (a) Right (b) Wrong
30. 30.Last-digit check: is 660 + 225 = 885 right or wrong? (a) Wrong (b) Right
31. 31.Last-digit check: is 80 × 54 = 4327 right or wrong? (a) Right (b) Wrong
32. 32.Last-digit check: is 451 + 344 = 795 right or wrong? (a) Wrong (b) Right
33. 33.Last-digit check: is 45 × 44 = 1977 right or wrong? (a) Wrong (b) Right
34. 34.Last-digit check: is 68 × 13 = 884 right or wrong? (a) Right (b) Wrong
35. 35.Last-digit check: is 626 + 850 = 1480 right or wrong? (a) Wrong (b) Right
36. 36.Last-digit check: is 96 × 43 = 4128 right or wrong? (a) Right (b) Wrong
37. 37.Last-digit check: is 36 × 25 = 900 right or wrong? (a) Wrong (b) Right
38. 38.Last-digit check: is 67 × 19 = 1273 right or wrong? (a) Wrong (b) Right
39. 39.Last-digit check: is 820 + 246 = 1071 right or wrong? (a) Wrong (b) Right
40. 40.Last-digit check: is 614 + 500 = 1114 right or wrong? (a) Wrong (b) Right

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